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Molecular Dynamics Simulations of Thermal Properties of Polymer Composites Enhanced by Cross-Linked Graphene Sheets

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Acta Mechanica Solida Sinica 2018年第6期31卷 673-682页

作者： Yunlong Li Shijie wang quan wang School of Mechanical Engineering Shenyang University of TechnologyShenliao West Road No.111 Shenyang 110870China Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen 518055China

Molecular models of pristine, functionalized and cross-linked graphene sheet/polymer composites are developed. Temperature cooling processes are conducted to examine the improve-ment of glass transition temperature of cross-linked graphene sheet/polymer composites using molecular dynamics simulations. The results show that increases of about 12.2% and 8.9% in the glass transition temperature of cross-linked graphene sheet/polymer composites are obtained, respectively, than those of the pristine and functionalized graphene sheet/polymer composites. In order to reveal the enhanced thermal properties from atomic views, the interfacial interaction energy and radius distribution function between the graphene sheets and the polymer matrix, the mean square displacement variations and the free volume of polymer composites are examined and discussed.

关键词： Molecular dynamics simulation Polymer composites Graphene sheet Glass tran-sition temperature

An efficient and versatile biopolishing strategy to construct high performance zinc anode

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Nano Research 2022年第6期15卷 5081-5088页

作者： Guoqiang Sun Mengqi Zhou Xi-Yan Dong Shuang-quan Zang Liangti qu Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis CenterCollege of ChemistryZhengzhou UniversityZhengzhou 450001China College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China Department of Chemistry&Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

Conventional strategies for highly reversible Zn anodes usually involve complex and time-consuming production processes of current collectors,expensive and toxic electrolyte additives,or the introduction of inactive materials in protective ***,we develop a fast,facile,and environmentally friendly biopolishing method to prepare dendrite-free Zn anodes,which merely involves the simple immersion of Zn foil in a biocompatible cysteine aqueous *** ravine structure formed by sulfhydryl etching for 30 min not only increases the electroactive area of Zn anode but also regulates the distribution of electric field and Zn ions,ensuring the homogeneous deposition and stripping of Zn *** biopolished Zn anode can be operated steadily for 2,000 h with a low voltage hysteresis at a current density of 1 mA·cm^(−2).In addition,Zn anodes with a cycle life of 500 h can be built by soaking for only 5 min,proving the high efficiency of the proposed *** strategy is generalized to substances with sulfhydryl groups for polishing Zn electrodes with improved *** cysteine-polished Zn//activated carbon supercapacitor can stably run for 20,000 cycles without obvious capacity *** proposed strategy shows potential for producing advanced Zn anodes.

关键词： biopolishing method sulfhydryl etching versatile ravine structure

Mechanism of action of Linggui Zhugan Decoction in treating non-alcoholic fatty liver disease using untargeted metabolomics approach

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Traditional Medicine Research 2025年第2期10卷 65-76页

作者： Huan Pei Ren-Lin Li Xin-Ran Song Qian-Qian Wan Yu-Ming wang Han-Zhou Li Wei-quan Xu Jia-Bao Liao Wei-Bo Wen Jing Miao Huan-Tian Cui School of Basic Medicine Yunnan University of Chinese MedicineKunming 650599China School Clinical Medical College Yunnan University of Chinese MedicineKunming 650599China First School of Clinical Medicine Yunnan University of Chinese MedicineKunming 650599China School of Integrative Chinese and Western Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Department of Pharmacy Tianjin Second People's HospitalTianjin 300192China

Background:Non-alcoholic fatty liver disease(NAFLD)is a liver disorder characterized by the accumulation and degeneration of fat in the liver cells,a condition that may further deteriorate and lead to cirrhosis and liver *** studies showed that metabolic dysfunction can promote NAFLD *** Zhugan Decoction(LGZGD)has therapeutic effects on *** mechanism of LGZGD still remains *** study was to examine the impact of LGZGD on the metabolic processes involved in the development of ***:A mice model of NAFLD was treated with *** therapeutic potential of LGZGD was evaluated by assessing the activity of transaminases,lipids levels of blood,and pathological changes in the liver of the mice model of ***,this study also evaluated the influence of LGZGD on liver inflammation and oxidative ***:The results of untargeted metabolomics analysis showed that LGZGD reduced the disordered lipid metabolism in NAFLD *** improved the oxidative stress and also reduced the levels of pro-inflammatory cytokines in the *** metabolomics analysis of liver samples revealed that LGZGD treatment improved metabolic disorders,including alanine,aspartate,glutamate,glycerophospholipid metabolism,and citrate *** RT-qPCR and Western blot results showed that LGZGD could regulate the expression of key enzymes in the metabolic pathway of the citrate cycle,including ATP-citrate lyase(ACLY),alanine-glyoxylate aminotransferase-2(AGXT2),phosphatidylethanolamine N-methyltransferase(PEMT),and succinate dehydrogenase(SDH).Conclusion:We found that LGZGD can treat NAFLD by reducing inflammatory responses,inhibiting oxidative stress,regulating alanine,aspartate,glutamate,and glycerophospholipid metabolism,and citrate cycle pathways.

关键词： NAFLD LGZGD untargeted metabolomics glycerophospholipid metabolism citrate cycle

Arithmetic Properties of Overpartition Triples

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Acta Mathematica Sinica,English Series 2017年第1期33卷 37-50页

作者： Liu quan wang Department of Mathematics National University of Singapore Singapore 119076 Singapore

Let P-3 （n） be the number of overpartition triples of n. By elementary series manipulations, we establish some congruences for P-3（n） modulo small powers of 2, such as P-3（16n＋14）≡0 （mod 32）, P-3（8n＋7）≡0 （mod 64）.We also find many arithmetic properties for P-3（n） modulo 7, 9 and 11, involving the following infinite families of Ramanujan-type congruences： for any integers α≥1 and n ≥ 0, we have

关键词： Partitions overpartition triples congruences theta functions

Design of a Passive Gait‑based Ankle‑foot Exoskeleton with Self‑adaptive Capability

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Chinese Journal of Mechanical Engineering 2020年第3期33卷 86-96页

作者： Xiangyang wang Sheng Guo Bojian qu Majun Song Haibo qu Robotics Institute School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control TechnologyMinistry of EducationBeijing Jiaotong UniversityBeijing 100044China School of Engineering Science KTH Royal Institute of Technology10044 StockholmSweden.

Propulsion during push-off is the key to realizing human *** have evolved a way of walking with high energy utilization,but it can be further *** inspiration from the muscle-tendon unit,a passive spring-actuated ankle-foot exoskeleton is designed to assist with human walking and to lengthen walking duration by mechanically enhancing walking *** of the gait events is realized using a smart clutch,which is designed to detect the contact states between the shoe sole and the ground,and automatically switch its working *** engagement of a suspended spring behind the human calf muscles is hence controlled and is in synchrony with *** device is completely passive and contains no external power *** is stored and returned passively using the *** our walking trials,the soleus electromyography activity is reduced by as much as 72.2%when the proposed ankle-foot exoskeleton is worn on the human *** influence of the exoskeleton on walking habits is also *** results show the potential use of the exoskeleton in humans’daily life.

关键词： Ankle-foot exoskeleton Energy cost Self-adaptiveness Human augmentation

Laser fabrication of functional micro-supercapacitors

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Journal of Energy Chemistry 2021年第8期30卷 642-665,I0014页

作者： Ying wang Yang Zhao Liangti qu Key Laboratory of Cluster Science Ministry of Education of ChinaBeijingKey Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of Technology100081 BeijingChina Key Laboratory of Organic Optoelectronics&Molecular Engineering of Ministry of Education Department of ChemistryTsinghua University100084 BeijingChina

Due to the rapid development of portable,wearable and implantable electronics in the fields of mobile communications,biomonitoring,and aerospace or defense,there is an increasing demand for miniaturized and lightweight energy storage ***-supercapacitors(MSCs)possessing long lifetime,high power density,environment friendliness and safety,have attracted great attention *** the performance of the MSCs is mainly related to the structure of the active electrode,there is a great need to explore the efficient fabricating strategies to deterministically coordinate the structure and functionality of *** that laser technology possesses many superior features of facility,high-precision,low-cost,high-efficiency,shape-adaptability and maneuverability,herein we summarize the development of laser technologies in MSCs manufacturing,along with their strengths and *** current achievements and challenges are also highlighted and discussed,aiming to provide a valuable reference for the rational design and manufacture of MSCs in the future.

关键词： Laser technology Micromachining Energy storage Micro-supercapacitor Integration

Role of dampers on the seismic performance of pin-supported wall-frame structures

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Earthquake Engineering and Engineering Vibration 2023年第2期22卷 453-467页

作者： wang Xiaoyue qu Zhe Gong Ting Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationSanhe 065201China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China China Re Catastrophe Risk Management Company Ltd. Beijing 100000China

Pin-supported(PS)walls have been proven effective in avoiding weak story failure of frame structures by increasing the height-wise continuous stiffness and producing uniform distribution of story ***,little attention has been given to the floor velocity or acceleration responses of PS wall-frame structures,which predominate the seismic damage of various nonstructural components that are critical to the immediate occupancy and quick recovery of *** paper presents a numerical evaluation of the floor velocity and acceleration responses of PS wall-frame structures,highlighting the effects of different types of dampers accompanying the PS *** results show that the PS walls alone significantly increase the peak floor velocity(PFV)and peak floor acceleration(PFA)*** wall-frame structures with either steel or viscoelastic(VE)dampers are much less effective in reducing the PFV or PFA responses than they are in reducing the peak inter-story drift ratio(PIDR).The impact of this behavior is demonstrated by a seismic fragility analysis that incorporates demand parameters combining the maximum PIDR,average PFV and *** results show that the use of VE dampers rather than hysteretic dampers results in better protection of nonstructural components in PS wall-frame structures.

关键词： strong spine system energy-dissipating device floor acceleration floor velocity nonstructural damage

Autonomous DNA walker： probing cell membrane dynamics

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Science China Chemistry 2017年第6期60卷 687-688页

作者： Jie wang quan Yuan College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China

We are all familiar with DNA as the substance that encodes the genomes of all living *** addition to genetic function,DNA is one of the smartest building blocks for innovative *** walker is a kind of self-assembled molecular machine that mimics the movement of protein motors in living ***,DNA walker consists of three parts：a single stranded DNA track,

关键词： walker DNA familiar anchorage innovative probing strand assembled things blocks

Magneto-induced Line Broadening of Magneto-sensitive Lines in Solar Magnetized Atmospheres

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Chinese Journal of Astronomy and Astrophysics 2005年第4期5卷 426-432页

作者： Zhong-quan qu Shuai wang Cheng-Lin Xu Xiao-Yu Zhang Ming-Guo Sun Chun-Lan Jin National Astronomical Observatories/Yunnan Astronomical Observatory Chinese Academyof Sciences Kunming 650011 Graduate School of the Chinese Academy of Sciences Beijing 100039

We analyze the spectral line broadening of those magneto-sensitive lines in solar magnetized atmospheres. The broadening at the line wings is due to the increase of the effective width of energy levels involved in Zeeman splitting,and the broadening at the line core also originated in Zeeman splitting under the condition that the Zeeman components are mixed. Therefore, the magneto-induced or Zeeman broadening take effects on the whole line. The observed Stokes parameter data in a sunspot and outside it acquired by Solar Stokes Spectrum Telescope （S^3T） are analyzed for the demonstration of this mechanism, and the Zeeman broadening rates are calculated for Fe16302.5 under some *** result shows that the broadening is increased as the magnetic field strength becomes stronger, but the rate of increase at the line core is decreased as the field strength increases, while the rate at the wing does not show such an obvious regularity. The broadening is more effective in the line core than in the wings.

关键词： sunspots - line: profiles-magnetic fields - radiative transfer-polarization